Demodulators – Phase shift keying or quadrature amplitude demodulator – Input signal combined with local oscillator or carrier...
Patent
1996-03-22
1997-08-12
Grimm, Siegfried H.
Demodulators
Phase shift keying or quadrature amplitude demodulator
Input signal combined with local oscillator or carrier...
329346, 375326, 375327, 375329, 375376, H04L 2722
Patent
active
056569718
ABSTRACT:
In a demodulation device for demodulating a phase-modulated wave, a baseband signal producing circuit produces a baseband signal having particular information which is dependent on the phase-modulated wave. Responsive to the baseband signal, a phase information producing circuit produces a phase difference signal. A reception logic circuit detects the baseband signal to produce an alarm signal when the particular information is not detected from the baseband signal. In response to the alarm signal, a reset signal producing circuit produces a reset signal. With reference to presence and absence of the reset signal, a selector selects, as a control signal, one of the phase difference signal and a cancelling signal which is supplied to the selector. In accordance with the control signal, a wave producing circuit produces a reproduced and a phase-shifted carrier wave which are used to make the baseband signal producing circuit produce the baseband signal.
REFERENCES:
patent: 5341105 (1994-08-01), Satou
patent: 5347228 (1994-09-01), Iwasaki
Grimm Siegfried H.
NEC Corporation
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